Rear sight for a pistol



FIG. 1 is a view in front perspective showing my design for a rear sight for a pistol, the pistol slide shown forming no part of my design;

FIG. 2 is a view in left side elevation, the right side being a mirror image thereof;

FIG. 3 is a top plan view thereof, the bottom view is plain and unadorned;

FIG. 4 is a front view hereof; and,

FIG. 5 is a back view thereof. 

The ornamental design for a rear sight for a pistol, as shown and described. 